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   Re: [xml-dev] Is Resource/Representation a fruitful abstraction? (was Re

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On Thu, Jan 30, 2003 at 10:14:37AM -0500, Mike Champion wrote:
> Sure, no dispute there.  The open question for me is whether "the Web as we 
> know it" proves the concept of URL's that *locate* something or other to be 
> determined by all sorts of context, MIME types, ad hoc conventions and out 
> of band agreements ... or whether it proves the concept of URIs that 
> *identify* abstract resources with representations.  The former is  much 
> less general and abstract than the latter, and I'm skeptical of the 
> argument that the success of the less general form proves the validity of 
> the more general form.

That's reasonable, except for one thing; the more general form is
already a success.  If you've ever used a firewall, you used the more
general form, because the client didn't have to do a gethostbyname()
(i.e. treat it as a locator) on the authority component of the URI.

The only place in *any* HTTP request-response chain that treats a URI as
a locator, is the next-to-last node, because it has to locate the last
node on the network.  Every other node, including the origin server,
treats it as an identifier.

MB
-- 
Mark Baker.   Ottawa, Ontario, CANADA.        http://www.markbaker.ca
Web architecture consulting, technical reports, evaluation & analysis




 

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